Author: Peter Fendrich
Date: 09:04:41 05/30/01
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On May 30, 2001 at 10:54:30, martin fierz wrote: >On May 29, 2001 at 14:21:13, Peter Fendrich wrote: > >>This position appeared in an ICC game: Guitje - TerraPi >> >> [D]2r3kb/5q1p/4pPp1/1p1pP3/p2P2Q1/PrP5/1P3R1R/2B3K1 w - - 0 42 >> >>the last move from Terra was 41... b5 >>Some moves earlier when white made g6, Terra decided to move the bishop from g7 >>to h8. >>Both Rb3 and Bh8 are locked in and Terra is absolutely unaware of the >>hopeless situation. Yes, Terra lost... >> >>I see two different but connected problems for computer programs here: >> - the closed position itself >> - the two blocked pieces. >> >>How do you solve/avoid positions like this? Terra has about equal eval for this >>position. >>It is of course possible to punish pawn chains like this in order to avoid >>closed positions but is that really a solution and how to deal with blocked >>positions? > >i wouldnt see what punishing pawn chains helps here. it seems to me >that with the bishop on f8 instead of h8 and the rook on c4 instead of >b3, black would be ok. so it's not really the pawn chain which is the >problem. of course you should recognize that the black king is not >better off than the white king with the pawn on f6. and that these >two pieces are trapped. this is probably too expensive, but if you just >look if your pieces can still move away from where they are without being >taken by a pawn, then you would see this. > >cheers > martin Agree. I know that some programs tries to avoid all sorts of closed positions by punishing long blocked pawn chains. I would like to find better ways to handle closed positions in general. The Rxh7 thing is of course still there but that's a serarch/extension issue which is not my worry right now. //Peter
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